Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dcc77b7332475b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 12:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcc396ddbebe96a96e8176c0d0a35db1 SHA-1: 809ee348efdaba79f67288008ac441ea5d9bf5cd SHA-256: 92dcc77b7332475bed7bfd5a7077d8ff23efe220e1a187e37c62f5baa267c7b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern observed is the use of a link farm to redirect users to potentially malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nowator-zpu.pl/userfiles/file/jimozuzebosajodaraxuve.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8847e567c5018eca402739c4628c4169/30209028200.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2df940d38---rodatewepenubiwasab.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e7c1f642---52526918744.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608373485d0eb---19045360965.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4dab75f9---pidirajewujojaxuradugosob.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc93c776ad7---neluruzuxofukuzerop.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b59aa13c---3297418095.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0dd273a3d1daf934098321f0dd6866b2/10496908042.pdf
    • http://altelaw.com/uploads/image/file/jenidonebebekipifiraxa.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609898717a644---96781012488.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3080c9ca3f29b2b7db36555679952b45/xapakivefupoditemabok.pdf
    • http://praxis-greve-polley.de/web/editor/files/11087128209.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a61340e3b3837d81826a7554d9f3f500/xoputazakofuv.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/dosaninuzifexiduj.pdf
    • https://digireg.se/upload/xuzuf.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/331a1fe088d03e5efdd57a761fa791a4/93288520187.pdf
    • https://ckmusicdesign.nluserfiles/file/torajopujigezofezafe.pdf
    • http://hotelgiottotorino.com/userfiles/files/luzatawuzudapure.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e942ccd34e---18867629098.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b6efbf548ad1f408b728270bd32dd749/30582876081.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070af6c44283---97141030065.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/luzomuzasulojukogele.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab809b6d3e5---39861731159.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=larry+connors+short+term+trading+strategies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 16792 bytes
font_01_sfnt_off000104f8.bin
d8cda1c34bfc851758405fb3a95c5e1ed74033df66fcb5297907a77a2b92c5d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 17560 bytes
font_02_sfnt_off000132db.bin
cc0891f2e3ee4758814f10b647781a2ae826382a4318b0a4206b09b782995118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 10840 bytes

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